text: /*	$OpenBSD: print-ip6opts.c,v 1.3 2006/12/09 01:12:28 itojun Exp $	*/
  
  /*
   * Copyright (C) 1998 WIDE Project.
   * All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the project nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #ifdef INET6
  #include <sys/param.h>
  #include <sys/time.h>
  #include <sys/types.h>
  #include <sys/socket.h>
  
  #include <netinet/in.h>
  #include <netinet/ip6.h>
  
  #include <stdio.h>
  
  #include "interface.h"
  #include "addrtoname.h"
  
  void
  ip6_opt_print(const u_char *bp, int len)
  {
      int i;
      int optlen;
  
      for (i = 0; i < len; i += optlen) {
  	switch (bp[i]) {
  	case IP6OPT_PAD1:
  	    optlen = 1;
  	    break;
  	case IP6OPT_PADN:
  	    if (len - i < IP6OPT_MINLEN) {
  		printf("(padn: trunc)");
  		goto trunc;
  	    }
  	    optlen = bp[i + 1] + 2;
  	    break;
  	case IP6OPT_ROUTER_ALERT:
  	    if (len - i < IP6OPT_RTALERT_LEN) {
  		printf("(rtalert: trunc)");
  		goto trunc;
  	    }
  	    if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) {
  		printf("(rtalert: invalid len %d)", bp[i + 1]);
  		goto trunc;
  	    }
  	    printf("(rtalert: 0x%04x) ", ntohs(*(u_short *)&bp[i + 2]));
  	    optlen = IP6OPT_RTALERT_LEN;
  	    break;
  	case IP6OPT_JUMBO:
  	    if (len - i < IP6OPT_JUMBO_LEN) {
  		printf("(jumbo: trunc)");
  		goto trunc;
  	    }
  	    if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) {
  		printf("(jumbo: invalid len %d)", bp[i + 1]);
  		goto trunc;
  	    }
  	    printf("(jumbo: %u) ", (u_int32_t)ntohl(*(u_int *)&bp[i + 2]));
  	    optlen = IP6OPT_JUMBO_LEN;
  	    break;
  	default:
  	    if (len - i < IP6OPT_MINLEN) {
  		printf("(type %d: trunc)", bp[i]);
  		goto trunc;
  	    }
  	    printf("(type 0x%02x: len=%d) ", bp[i], bp[i + 1]);
  	    optlen = bp[i + 1] + 2;
  	    break;
  	}
      }
  
  #if 0
  end:
  #endif
      return;
  
  trunc:
      printf("[trunc] ");
  }
  
  int
  hbhopt_print(register const u_char *bp)
  {
      const struct ip6_hbh *dp = (struct ip6_hbh *)bp;
      register const u_char *ep;
      int hbhlen = 0;
  
      /* 'ep' points to the end of avaible data. */
      ep = snapend;
      TCHECK(dp->ip6h_len);
      hbhlen = (int)((dp->ip6h_len + 1) << 3);
      TCHECK2(*dp, hbhlen);
      printf("HBH ");
      if (vflag)
  	ip6_opt_print((const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp));
  
      return(hbhlen);
  
    trunc:
      fputs("[|HBH]", stdout);
      return(hbhlen);
  }
  
  int
  dstopt_print(register const u_char *bp)
  {
      const struct ip6_dest *dp = (struct ip6_dest *)bp;
      register const u_char *ep;
      int dstoptlen = 0;
  
      /* 'ep' points to the end of avaible data. */
      ep = snapend;
      TCHECK(dp->ip6d_len);
      dstoptlen = (int)((dp->ip6d_len + 1) << 3);
      TCHECK2(*dp, dstoptlen);
      printf("DSTOPT ");
      if (vflag) {
  	ip6_opt_print((const u_char *)dp + sizeof(*dp),
  	    dstoptlen - sizeof(*dp));
      }
  
      return(dstoptlen);
  
    trunc:
      fputs("[|DSTOPT]", stdout);
      return(dstoptlen);
  }
  #endif /* INET6 */
  